235 高圧水素の流量計測に用いられるコリオリ質量流量計

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  • 235 Coriolis Mass Flowmeter for Flow Measurement of High Pressure Hydrogen

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In order to prepare for the sales expansion of FCV (fuel-cell vehicle) around the comer, hydrogen stations are steadily increasing. We released a most suitably designed Coriolis flowmeter for hydrogen dispensers in 2005. Since then, the models have been adopted in many hydrogen stations of pressure levels, 35MPa and 70MPa and accumulating its quantity delivered for flow measurement, as well as contributing to R&D by relevant FCV makers. In a verification test by JHFC (Japan Hydrogen & Fuel Cell Demonstration Project) , the flowmeter achieved the target for 70MPa hydrogen dispensers of filling in a FCV's 5kg tank in 3 min. by improving the filling time and efficiency to the better. Further, safety functions have constantly been under consideration, resulting in to change the measuring tube material from Alloy C to SUSS 10S, which does not embrittle even when exposed to high pressure hydrogen gas. In this thesis, technical features of the flowmeter and results of the filling tests are introduced, and the improvement process up to now and future prospects are reported.

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